期刊
MATERIALS & DESIGN
卷 108, 期 -, 页码 207-216出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.06.095
关键词
Grain refinement; Shear spinning; Deformation bands; Deviation ratio; Aluminium alloy
资金
- National Science Fund for Excellent Young Scholars of China [51222509]
- National Natural Science Foundation of China [51175429]
- Research Fund of the State Key Laboratory of Solidification Processing [97-QZ-2014, 90-QP-2013]
- EU FP7 Marie Curie International Research Staff Exchange Scheme (IRSES, MatProFuture) [318968]
To investigate the grain refinement and its mechanism in shear spinning, microstructures of shear spun parts made by aluminium alloy under different deformation conditions, induced by different shear spinning deviation ratios, are studied. The results show that, after shear spinning, the microstructure is distributed symmetrically about a zone in sheet thickness defined as the neutral zone which is located between the inner surface and the middle plane of spun sheet thickness. Various deviation ratios in shear spinning can lead to grain refinement in different regions along thickness direction of the spun part. The microstructure characteristics indicate that the mechanism of grain refinement is due to the formation of deformation bands (DBs). It is observed that in DBs, parallel geometrically necessary boundaries (GNBs) formed by a zero deviation ratio and crossed GNBs formed by positive and negative deviation ratios are due to the different stress states induced by various deviation ratios in shear spinning. Due to the influence of grain refinement, micro hardness increases with the decreasing of the deviation ratio. The average value is increased by 16.04% under a negative deviation ratio compared to the initial micro hardness of the sheet. (C) 2016 Elsevier Ltd. All rights reserved.
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